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Description
openedon Feb 10, 2020
Hi,
#![feature(generator_trait)]
#![feature(generators)]
use std::ops::Generator;
fn gen() -> impl Generator<usize> {
|_: usize| {
println!("-> {}", yield);
}
}ICEs, on today's nightly, with:
error: internal compiler error: src/librustc_mir/transform/promote_consts.rs:467: _1 = suspend(move _21) -> [resume: bb2, drop: bb3] not promotable
--> src/lib.rs:8:27
|
8 | println!("-> {}", yield);
| ^^^^^
backtrace
thread 'rustc' panicked at 'Box<Any>', <::std::macros::panic macros>:2:4
stack backtrace:
0: backtrace::backtrace::libunwind::trace
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.40/src/backtrace/libunwind.rs:88
1: backtrace::backtrace::trace_unsynchronized
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.40/src/backtrace/mod.rs:66
2: std::sys_common::backtrace::_print_fmt
at src/libstd/sys_common/backtrace.rs:77
3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
at src/libstd/sys_common/backtrace.rs:59
4: core::fmt::write
at src/libcore/fmt/mod.rs:1052
5: std::io::Write::write_fmt
at src/libstd/io/mod.rs:1428
6: std::sys_common::backtrace::_print
at src/libstd/sys_common/backtrace.rs:62
7: std::sys_common::backtrace::print
at src/libstd/sys_common/backtrace.rs:49
8: std::panicking::default_hook::{{closure}}
at src/libstd/panicking.rs:204
9: std::panicking::default_hook
at src/libstd/panicking.rs:224
10: rustc_driver::report_ice
11: std::panicking::rust_panic_with_hook
at src/libstd/panicking.rs:474
12: std::panicking::begin_panic
13: rustc_errors::HandlerInner::span_bug
14: rustc_errors::Handler::span_bug
15: rustc::util::bug::opt_span_bug_fmt::{{closure}}
16: rustc::ty::context::tls::with_opt::{{closure}}
17: rustc::ty::context::tls::with_opt
18: rustc::util::bug::opt_span_bug_fmt
19: rustc::util::bug::span_bug_fmt
20: rustc_mir::transform::promote_consts::Validator::validate_local
21: core::ops::function::impls::<impl core::ops::function::FnMut<A> for &mut F>::call_mut
22: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::from_iter
23: <rustc_mir::transform::promote_consts::PromoteTemps as rustc_mir::transform::MirPass>::run_pass
24: rustc_mir::transform::run_passes
25: rustc_mir::transform::mir_validated
26: rustc::ty::query::__query_compute::mir_validated
27: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
28: rustc_mir::borrow_check::mir_borrowck
29: rustc::ty::query::__query_compute::mir_borrowck
30: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
31: rustc_mir::borrow_check::type_check::TypeChecker::check_rvalue
32: rustc_mir::borrow_check::type_check::TypeChecker::typeck_mir
33: rustc_mir::borrow_check::type_check::type_check
34: rustc_mir::borrow_check::nll::compute_regions
35: rustc_mir::borrow_check::do_mir_borrowck
36: rustc::ty::context::GlobalCtxt::enter_local
37: rustc_mir::borrow_check::mir_borrowck
38: rustc::ty::query::__query_compute::mir_borrowck
39: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::mir_borrowck>::compute
40: rustc::dep_graph::graph::DepGraph::with_task_impl
41: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
42: rustc::ty::<impl rustc::ty::context::TyCtxt>::par_body_owners
43: rustc_interface::passes::analysis
44: rustc::ty::query::__query_compute::analysis
45: rustc::dep_graph::graph::DepGraph::with_task_impl
46: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
47: rustc::ty::context::tls::enter_global
48: rustc_interface::interface::run_compiler_in_existing_thread_pool
49: scoped_tls::ScopedKey<T>::set
50: syntax::attr::with_globals
This issue has been assigned to @chrissimpkins via this comment.
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Area: Constant evaluation (MIR interpretation)Area: CoroutinesCategory: This is a bug.Call for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue.Call for participation: Help is requested to fix this issue.Call for participation: This issue has a mentor. Use #t-compiler/help on Zulip for discussion.`#![feature(coroutines)]`Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Relevant to the compiler team, which will review and decide on the PR/issue.This issue requires a nightly compiler in some way.